Air-compressor.



J. R. KINNEY.

AIR COMPRESSOR.

APPLICATION rum) SEPT. a, 1911.

1,054,21 1. Patented Feb. 25, 1913.

2 SHEETS-SHEET 1.

Wtnesses: liwentor: M Jusfilfilnnqy,

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JUSTUS R. KINNEY, OF DORCHESTER. MASSACHUSETTS.

AIR-CGMPRESSOR.

Specification of Letters Patent.

Patented Feb. 25, 1913.

Application filed September 8. 1911. Serial No. 648,376.

To all whom it may concern Be it known that I, JFSTUS R. Kixxrv, acitizen of the United States of America, and a resident of Dorchester,in the county. of Suffolk and State of Massachusetts, have inventedcertain ne'. and useful Improvements in Air-Compressors, of which thefollowing is a specification.

This invention relates to air compressors and particularly to devices ofthis class in which a rotary piston is mounted in a cylindrical pistonchamber, and is provided with a radial blade adapted to reciprocate inan oscillating member provided for the purpose of controlling thedischarge.

The invention consists primarily in providing said oscillating memberwith one or more discharge ports communicating at the inner end with apassage in said radial blade and communicating at the other endtemporarily with discharge outlets in the compressor casing or a bushingmounted therein.

The invention t'mrther consists in so constructing and positioning theport or ports in said oscillating member that they will be out ofregister with the discharge outlets during the first half of the cycleof said rotary piston, and will register with said ports during aportion of the last half of the cycle of said piston.

The invention further consists in certain novel features of constructimiand arrangement of parts which will be readily understood by referenceto the description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents a transverse section of an aircompressor cmbodying the features of the present invention, the cuttingplane being on line 1-1 on Fig.'2, and Fig. 2 represents a longitudinalvertical section of the same, the cutting plane being on line 22 on Fig.1.

Similar characters designate like parts throughout the drawings.

In the drawings, 10 represents a casing member provided with acylindrical piston chamber 11, an inlet compartment 12, and an outletcompartment 13. The inlet compartment 12 communicates with the pistonchamber 11 by means of the passage 14 Interposed between the inletcompartment and the outlet compartment 13 is a cylindrical bushing 15provided with discharge outlets 1t; and 17, registering with thepassages 18 and 19 in thewall 20 of said casing,

these passages 18 and 1t) communicating with the outlet compartment 13from which extends the discharge pipe 21. The bushing 1.") is fixedlysecured in the casing 10 by the set screw 15* and has mounted therein acylindrical member 22 having a central longitudinal slot 23 therein, inwhich is positioned a radial blade 21 formed upon or secured to theannular piston member 25 mounted upon an eccentric 26 keyed to a shaft27 revoluble in bearings 28 extending outwardly from the end plates 29forming the end walls of said piston chamber 11. The bushing 15 extendsinto recesses formed in the inner faces of these end walls 25, asindicated at 230 in Fig. 2 of the drawings, the central portions of saidbushing being supported by the central partition 31. Prcfe 'ably twopiston chaml'iers 11 are used in each compressor, one on either side ofthe central partition 211,11 indicated in Fig. 2, and in caTr'h' iistonchamber is mounted an annular piston 25, these pistons being oppositelydisposed as indicated in saul ligure. In the bushing 15 are mountedpreferably two oscillating members 22, placed end for end, and extendinginto the recesses in the inner faces of the end plates 29, these members22 being adapted to oscillate independently of one another. Jach blade24 is provided with a passage in one face thereof, this passagecommunicating at all times with the ports 33 and 3-1, extendingsubstantially radially from the slot 23 to the periphery of theoscillating members 22. The inner end of the passage 32 is somewhatremoved from the periphery of the member 25 and as a consequence thedischarge through this passage is entirely out off during a portion ofthe cycle of the piston.

Air is admitted to the compressor through the inlet between which andthe inlet compartment 12 is interposed a valve 36 adapted to be held toits seat by the pressure within the compressor when the said compressoris not in operation. \Vhen it is desired to operate the compressor thepiston is revolved in the direction of the arrow a on Fig. 1 of thedrawings, and the suction caused by the rotation of said piston willcause the valve 36 to open and permit the admission of air through theinlet 35 into the inlet compartment 12 and thus into tiles and is onlyclosed when the piston thereof is at rest. From an inspection of Fig. 1of the drawings, it is obvious that during the first half of the cycleof said piston25 the outlets 16 and 17 in the bushing 15 will be out ofregister with the ports 33 and 34 formed in the oscillating members 22.By this means the air in advance of the piston 25 will be compressed inthe chamber 11 inasmuch as it has no opportunity to escape therefrom. Assoon, however, as the piston passes a central point, that is theposition indicated in Fig. 1 of the drawings,..the movement of the blade24 will cause the oscillation of the member 22, thereby bringing theports 33 and 34 into register with the discharge openings 16 and 17 thuspermitting the air which has been compressed in the piston chamber 11 topass "therefrom through the passage 32, ports 33 and 34, out-' lets 16and 17, into the outlet compartment 13. By the time the piston 25reaches its uppermost central position that is, a position directlopposed to that indicated in Fig. 1 of the drawings, it is quite obviousthat the ports 33' and-34 will againbe out of register with thedischarge openings 16 and 17 on account ofthe oscillation of the member22, and these ports and discharge openings will remain out ofrdgisteruntil the piston again reaches the position shown in Fig. 1 of thedrawings. It is self-evident that by shutting off the discharge in theman.- ner indicated during the first half of the cycle of the piston, anincreased compression is secured in the piston chamber, andthe'efiectiveness of the compressor is consequently greatly increased.Moreover, it is obvious that owing to the fact that all communication isshut off between the outlet chamber 13 and the piston chamber 11 duringthe first half of the cycle of the piston 25, there can be no back.pressure on said piston and during this portion of its movement thepiston 25 will operate against atmospheric pressure only. This forms animportant feature of the present invent on.

By loosening the set screw 15* and turning the bushing 15 about its axisthe ports 16 and; 17 therein may be sopositioned relative to" thepassages and 34 inthe oscillating members 22 that compression maycommence at varying points in the last half of the cycle of the piston25, thereby securing varying degrees of compression. This is desirableas by this adjustment-"of the valve mechanism the device maybe made tocompress the air within the piston chamber to just the degree desired inthe storage tank with which the pipe 21 is intended to communicate. Whenit has been determined what pressure is desired in said tank the bushing15 is so set as to secure that degree of compression.

It is believed that the operation and many advantages of the inventionwill be fully understood from the foregoing.

Having thus described my invention, claim: 1. In a device of the classdescribed, the combination with a casing having a cylindrical pistonchamber, an inlet passage in direct communication therewith, a checkvalve in, said inlet passage, and an outlet compartment; a. rotarypiston in said chamber; and valve mechanism interposed between saidoutlet compartment and piston chamber and adapted to be automaticallyclosed during the first half of the cycle of said piston and openedduring a portion of the last half of the cycle of said plston.

2. In a device of the class described, the combination with a casinghaving a cylindrical piston chamber, an inlet passage in directcommunication therewith, a check valve in said inlet passage, andanoutletcompartment; a rotary piston in said chamher; and valvemechanism interposed between said outlet compartment and piston chamberoperable by the rotation'of said piston and closed thereby during thefirst half of its cycle, and opened during a portion of the last half ofthe cycle of said piston.

'3. In a device of the class described, the

combination with a'casing having a cylindrical piston chamber, an inletpassage in direct communication therewith, a check valve in said inletpassage, and an outlet compartment; a rotary piston in said chamher; aradial blade rigidly secured to said piston having a passage therein;and an oscillating member having a slot within which said blade isadapted to reciprocate, and-L provided with a radial port communicatingconstantly at one end with said blade pas sage and adapted tocommunicate at the other end during the oscillation of said member witha passage to said outlet comnormally fixedly secured -in positionsurrounding said oscillating member and having an opening therethroughto said outlet compartment adapted to register with said radial portduring a portion of the movement of said oscillating member.

5. In a device of the class described, the

combination with a casing having a cylindrical piston chamber, an inletpassage in direct commpnication therewith; a check valve in said inletpassage, and an outletcompartment; a rotary piston in said chamber; aradial blade rigidly secured to said piston having a passage therein; acylindrical oscillating member having a slot within which said blade isadapted to reciprocate and provided with a radial port communicatingwith said blade passage; and a bushing normally fixedly secured in posi-'tion surrounding said oscillating member movement 0 and having anopenin therethrough to said outlet compartment a apted to register withsaid radial ort during a portion of the t said oscillating member.

6. In a device of the class described, the

, combination with a casing having a cylinin which said blade is adaptedto reciprocate and provided with radial ports from said slot to itsouter periphery; and a bushing normally fixedly securedin positionsurrounding said oscillating member having openings therethrough to saidoutlet compartment adapted to temporarily register with said radialports.

7. In a device of the class described, the combination with a" casinghaving a cylindrical piston chamber, an inlet passage in directcommunication therewith; a check valve in said inlet passage, andan.outlet compartment; a rotar piston in said chamber; a radial bladerigidly secured to said piston having a passage therein; a cylindricaloscillating member havin a slot within which said blade is adapte toreciprd cate and providing with radial ports from said slot to its outerperiphery; and a bushing normally fixedly secured in positionsurrounding said oscillating member having openings therethrough to saidoutlet compartment adapted to register with said radial ports during thelast half of the cycle of said piston.

8. In a device of the class described, the combination with a casinghaving a cylindrical piston chamber, an inlet passage in directcommunication therewith, a check valve in said inlet passage, and anoutlet compartment; a rotary piston in said chamber; a radial bladerigidly secured to said piston having a passage therein; a cylindricaloscillating member having a slot within which said blade is adapted toreciprocate and provided with radial ports from said slot to its outerperiphery; and a bushing normally fixedly secured in positionsurrounding said oscillating member having openings therethrough to saidoutlet compartment adapted to register with said radial ports during thelast half of the cycle of said piston and to be closed by saidoscillatin member during the first half of the cycle 0 said piston.

9. In a device of the class described, the combination with casinghaving a cylindrical piston chamber, an inlet passage in directcommunication therewith, a check valve in said inlet passage, and anoutlet compartment; a rotary piston in said chamber; an

oscillating valve in said outlet passage provided with a diametricalslot therethrough and outlet ports communicating with said slot; aradial blade rigidly secured to said piston extending through said slotand adapted, to oscillate said valve during the rotation of said piston;and a bushing normally fixedly secured in position inclosing said valvehaving discharge openings therein adapted to register with the valveports during the last part of the cycle of said piston.

10. In device of the class described, the combination with a casinghaving a cylindrical piston chamber, an inlet passagecom:

municating therewith and an outlet compartment; a rotar piston in saidchamber; 1 a radial blade rigldly secured to said piston having apassage therein; an oscillating member havin a slot within which saiblade is adapte to reciprocate, and provided with a radial portcommunicating with said blade passage; a bushing surrounding saidoscillating member and having an opening therethrough to said outletcompartment adapted to register with said radial port during a portionof the movement of said oscillating member; and means for fixedlysecuring said bushing in adjusted positions relative to said casing.

11. In a device of the class described, the combination with a casinghaving a cylindrical piston chamber, an inlet passage in directcommunication therewith and an outlet compartment; a check valve in saidinlet passage; a rotary piston in said chamber; a radial blade rigidlysecured to said piston having a passage therein; an oscillating memberhaving a slot within which said blade is adapted to reciprocate, andprovided with a radial port communicating with said blade passage; abushing surrounding said oscillating member and having an openingtherethrough to said outlet compartment adapted to register with saidradial port during a portion of the move ment of said oscillatingmember; and a set screw for fixedly securing said bushing in adjustedpositions relative to said casing.

12. In a device of the class described, the combination with a casinhaving a cylindrical piston chamber, an lnlet passage communicatingtherewith normally closed by a check valve, and an outlet compartment, a

rotary piston in said chamber; and valve mechanism interposed betweensaid outlet compartment and piston chamber operable by the rotation ofsaid piston and closed thereby during the first half of its cycle andopen during a portion of the last half of the cycle of said piston.

13. In a device of the class described, the combination With a casinghaving a cyindrical piston chamber; an inlet passage in directcommunication therewith; a check valve in said inlet passage, and anout-let compartment; a rotary piston in said chamher; a radial bladerigidly secured to said piston having a passage therein the inner end ofwhich is somewhat removed from the periphery of said piston; and anoscil- 'lating member having a slot Within which

